GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module
Table 2: Heating and Air Conditioning
Table 3: Rear Auxiliary Climate Module
Table 4: Rear HVAC
Table 5: Engine

Body Control Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine idling, A/C ON, ambient air temperature between 22-27°C (70-80°F)

Left Solar Sensor

Data

Counts

Varies

Right Solar Sensor

Data

Counts

Varies

Heating and Air Conditioning

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine idling, A/C ON, ambient air temperature between 22-27°C (70-80°F)

A/C Switch

Input/Output

On/Off

Off

AC Permission

Input/Output

Withheld/Granted

Varies

Air Inlet Door Actual

Door Positions

Counts

Varies

Air Inlet Door Commanded

Door Positions

Counts

Varies

Air Inlet Motor Drive

Door Positions

Stop/Increase/Decrease

Stop

Air Mix Door Left Commanded

Door Positions

Counts

Varies

Air Mix Door Right Commanded

Door Positions

Counts

Varies

Auto Switch

Input/Output

On/Off

Off

Battery Voltage

Input/Output

Volts

13.5-14.5 V

Blower Motor PWM Speed

Door Positions

Percent

12-114%

Engine Coolant Temp

Sensor Data

°C/°F

Varies

Fan Down Button

Input/Output

On/Off

Off

Fan Up Button

Input/Output

On/Off

Off

Front Defrost Switch

Input/Output

On/Off

Off

Ign. Since Current DTC

Input/Output

Numeric

0 Cycles

Inside Air Temp. Sensor

Sensor Data

°C/°F

Varies

Inside Air Temp. Fan

Sensor Data

On/Off

On

Left Mix Door Actual

Door Positions

Counts

Varies

Left Mix Motor Drive

Door Positions

Stop/Increase/Decrease

Stop

Left Temp. Setting

Input/Output

°C/°F

Varies

LH AC Duct Actual

Sensor Data

Counts

Varies

LH AC Duct Desired

Sensor Data

Counts

Varies

LH Heater Duct Actual

Sensor Data

Counts

Varies

LH Heater Duct Desired

Sensor Data

Counts

Varies

Mode Door Actual

Door Positions

Counts

Varies

Mode Dr. Motor Command

Door Positions

Counts

Varies

Mode Motor Drive

Door Positions

Stop/Increase/Decrease

Stop

Mode Select Position

Door Positions

Off/Auto/Defrost/Heater/Htr./Def./Bi-Level/Panel

Varies

Mode Switch

Input/Output

On/Off

Off

Off Switch

Input/Output

On/Off

Off

Outside Air Temp. Filtered

Input/Output

°C/°F

22-27°C (70-80°F)

Outside Air Temp. Raw

Input/Output

°C/°F

Varies

Pressure Cycle Switch

Input/Output

Low Pressure/Normal

Varies

Recirculate Switch

Input/Output

On/Off

Off

RH AC Duct Actual

Sensor Data

Counts

Varies

RH AC Duct Desired

Sensor Data

Counts

Varies

RH Heater Duct Actual

Sensor Data

Counts

Varies

RH Heater Duct Desired

Sensor Data

Counts

Varies

Right Mix Door Actual

Door Positions

Counts

Varies

Right Mix Motor Drive

Door Positions

Stop/Increase/Decrease

Stop

Right Temp. Setting

Input/Output

°C/°F

Varies

Rear Auxiliary Climate Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine idling, A/C ON, ambient air temperature between 22-27°C (70-80°F)

Air Temp. Switch Pos.

Front Aux. Controls

Numeric

Varies

Ambient Air Temp. Sensor

Data

°C/°F

Varies

Aux. Temp Dr. Motor Command

Door Positions

Counts

Varies

Aux. Temp Dr. Motor Status

Door Positions

Stop/Increase/Decrease

Stop

Aux. Temp Dr. Position

Door Positions

Counts

Varies

Battery Voltage

Data

Volts

13.5-14.5 Volts

Blower Switch Pos.

Front Aux. Controls

Numeric

Varies

Engine Coolant Temp.

Data

°C/°F

Varies

Ign. Since Current DTC

Data

Cycles

0 Cycles

Inside Air Temp. Fan

Input/Output

On/Off

On

Inside Air Temp. Sensor

Data

Counts

Varies

Lower Heater Duct Actual

Data

Counts

Varies

Mode Door Actual

Door Positions

Counts

Varies

Mode Motor Drive

Door Positions

Stop/Increase/Decrease

Stop

Mode Dr. Motor Command

Door Positions

Counts

Varies

Mode Switch Pos.

Front Aux. Controls

Numeric

Varies

Rear HVAC Fan Select Pos.

Input/Output

Auto/Off/Low/Med/High

Auto

Rear HVAC Mode Select Pos.

Input/Output

Auto/Floor/Bi-Level/Panel

Auto

Upper Htr. Duct Actual

Data

Counts

Varies

Rear HVAC

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine idling, A/C ON, ambient air temperature between 22-27°C (70-80°F)

Battery Voltage

Data

Volts

13.5-14.5 Volts

Ign. Since Current DTC

Data

Cycles

0 Cycles

Rear HVAC Fan Down Sw.

Data

Active/Inactive

Inactive

Rear HVAC Fan Speed

Data

Auto/Off/Low/Med/High

Auto

Rear HVAC Fan Up Switch

Data

Active/Inactive

Inactive

Rear HVAC Mode Switch

Data

Active/Inactive

Inactive

Rear HVAC Motor Pos.

Data

Off/Auto/Lower/Bi-Level/Upper

Varies

Rear Temp. Select Sw.

Data

Up/Down/Inactive

Inactive

Engine

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine idling, A/C ON, ambient air temperature between 22-27°C (70-80°F)

A/C Pressure Sensor

Engine Data 2

kPa/psi

629-845 kPa (85-120 psi)

A/C Pressure Sensor

Engine Data 2

Volts

Varies

A/C Relay Command

Engine Data 2

On/Off

Varies

A/C Request Signal

Engine Data 2

Yes/No

Varies

ECT Sensor

Engine Data 2

°C/°F

92°C (197°F)